Further Workplace Health and Safety bosses will be grilled at the inquest into the Dreamworld disaster today, after a leading inspector admitted he had "no confidence" in the emergency procedures in place on the Thunder River Rapids ride.

Vic man arrested over Frenchman's NT death

A Melbourne man has been arrested over the stabbing death of a French tourist in the Northern Territory in an alleged unprovoked attack in front of the victim's wife.

AAP understands Pande Veleski is currently in NT police custody.

The French couple had only recently arrived in Australia and were alone at the Connor Well rest stop on the Stuart Highway, about 135km north of Alice Springs, when approached by an unknown man on Wednesday afternoon.

"The man has allegedly then stabbed the male tourist to the neck, in an unprovoked attack," Detective Superintendent Travis Wurst said on Thursday.

The 33-year-old visitor died at the scene.

Det Supt Wurst said the victim's wife, 30, was in Alice Springs Hospital being treated for shock but had not been physically injured by the attacker. She was still to be interviewed by detectives.

The French tourists had stopped at a remote NT rest stop. (Supplied). ()